#include<stdio.h>
int main(){
	char cGrade;
	printf("please enter your grade\n");
	scanf("%c",&cGrade);
	printf("Grade is about:");
	switch(cGrade){
		case'A': 
			printf("90~100\n");
			break;
		case'B': 
			printf("80~89\n");
			break;
		case'C': 
			printf("70~79\n");
			break;
		case'D': 
			printf("60~69\n");
			break;
		case'F': 
			printf("<60\n");
			break;
		default: 
			printf("you enter the char is wrong!\n");
			break; 
	}
	return 0;
}
